See the complaint on #4039. This doesn't fix that particular
issue (it's somewhat unrelated), but does solve around
a file parsing problem reported by @void-in
1. InitialAutoRunScript and AutoRunScript vars work
2. scripts/shells was created to hold them
3. *_shell methods were renamed shell_*
4. added "shell_command" method to command shell sessions
5. converted all uses of *_shell to shell_*
6. all payloads that produce command shell sessions include Msf::Sessions::CommandShellOptions
git-svn-id: file:///home/svn/framework3/trunk@8615 4d416f70-5f16-0410-b530-b9f4589650da